WK 5: Skin Functions and Structure
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Questions and Answers

What is the characteristic of thin skin?

  • It lacks hair and sebaceous glands
  • It has a thick layer of keratinocytes
  • It is found only on the face
  • It usually contains hair (correct)

Which cell type is responsible for skin pigmentation?

  • Melanocytes (correct)
  • Langerhans cells
  • Keratinocytes
  • Merkel cells

What is the main cause of Squamous Cell Carcinoma?

  • Hormonal imbalance
  • Viral infection
  • Genetic mutation
  • Chronic sun exposure (correct)

Which of the following is NOT a function of skin?

<p>Digestion (A)</p> Signup and view all the answers

What is the outermost layer of the skin?

<p>Epidermis (A)</p> Signup and view all the answers

What type of cancer arises in pigment cells of the skin?

<p>Melanoma (C)</p> Signup and view all the answers

Where is thick skin typically found?

<p>Palms and soles of feet (B)</p> Signup and view all the answers

What is the function of sebum, a secretion of sebaceous glands?

<p>To waterproof skin (C)</p> Signup and view all the answers

What type of secretion do sebaceous glands produce?

<p>Holocrine (B)</p> Signup and view all the answers

Where are sebaceous glands most numerous?

<p>On the face, scalp, forehead, and upper thorax (C)</p> Signup and view all the answers

What is a common skin condition that usually begins in adolescence?

<p>Acne vulgaris (C)</p> Signup and view all the answers

What is the thinnest part of the dermis?

<p>Papillary layer (D)</p> Signup and view all the answers

What type of cancer is the most common in Australians under fifty years of age?

<p>Melanoma (A)</p> Signup and view all the answers

What is the thickness of the dermis in the palms and soles of the feet?

<p>~3mm (D)</p> Signup and view all the answers

What is the primary function of eccrine sweat glands?

<p>Regulating body temperature through thermoregulation (C)</p> Signup and view all the answers

Where are apocrine glands typically located in the body?

<p>Primarily in the axilla, anal region, and areola of nipple (A)</p> Signup and view all the answers

What type of cells form a margin around the secretory units of eccrine glands?

<p>Myoepithelial cells (D)</p> Signup and view all the answers

What is the composition of sweat initially secreted by eccrine glands?

<p>Water, sodium, and potassium ions (D)</p> Signup and view all the answers

What happens to the ions in sweat as it reaches the surface of the skin?

<p>They are absorbed by the epithelial lining (D)</p> Signup and view all the answers

What is the characteristic of the secretion produced by apocrine glands?

<p>It is viscous and odourless (B)</p> Signup and view all the answers

Where are eccrine glands most abundant in the body?

<p>Primarily on the forehead, axillae, palms, and soles (D)</p> Signup and view all the answers

What triggers the sebaceous glands to produce more sebum?

<p>Hormonal changes during puberty (C)</p> Signup and view all the answers

What is the main cause of acne vulgaris?

<p>Hormonal imbalance (B)</p> Signup and view all the answers

What blocks the hair follicle and leads to acne?

<p>Dead skin cells (C)</p> Signup and view all the answers

What contributes to the inflammation in acne?

<p>Bacteria accumulation (B)</p> Signup and view all the answers

What happens to the sebaceous glands during puberty?

<p>They respond to androgens by producing more sebum (D)</p> Signup and view all the answers

What is the result of the skin cells not being shed normally?

<p>Whitehead formation (A)</p> Signup and view all the answers

What is the role of stress in acne development?

<p>It increases androgen production (C)</p> Signup and view all the answers

What is the term for the plug that forms in the hair follicle?

<p>Comedone (D)</p> Signup and view all the answers

What is the genetic contribution to acne development?

<p>Hereditary factors contribute, but the exact mechanism is unknown (A)</p> Signup and view all the answers

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